<html>
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width,initial-scale=1.0" />
    <script src="https://unpkg.com/vue@next"></script>
    <!-- import CSS -->
    <link rel="stylesheet" href="https://unpkg.com/element-plus/dist/index.css">
    <!-- import JavaScript -->
    <script src="https://unpkg.com/element-plus"></script>

    <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js"></script>

    <title>Element Plus demo</title>
  </head>
  <body>
    <div id="app">
      <el-button>{{ message }}</el-button>
      <div class="demo-collapse">
        <el-collapse v-model="activeNames" @change="handleChange">
          <el-collapse-item title="测试1" name="1">
            <div>
                <ul list-group>
                    <li class="list-group-item">
                        <el-link href="./FlexBaseDemo.html" >flex属性排版</el-link>
                    </li>
                </ul>
                
            </div>
          </el-collapse-item>
          <el-collapse-item title="测试2" name="2">
            <div>

            </div>
          </el-collapse-item>
          <el-collapse-item title="测试3" name="3">
            <div>

            </div>
          </el-collapse-item>
          <el-collapse-item title="测试4" name="4">
            <div>

            </div>
          </el-collapse-item>
        </el-collapse>
      </div>

    </div>
    <script>
      const App = {
        data() {
          return {
            message: "Hello Element Plus",
            activeNames:"1"
          };
        },
      };
      const app = Vue.createApp(App);
      app.use(ElementPlus);
      app.mount("#app");
    </script>
  </body>
</html>